Cyanoacetic acid → 1-(2-Cyanoacetyl)-3-(2-fluoro-4-iodophenyl)-urea

Beteiligte Stoffe

Reaktionsschritte

To a mixture of (2-fluoro-4-iodophenyl)-urea 78 (21.7 g) and cyanoacetic acid 73 (7.88 g) in N,N-dimethylformamide (108 ml) was added, and methanesulfonyl chloride (7.17 ml) was added dropwise with stirring at room temperature. The mixture was stirred at room temperature for 2 hrs, and water-isopropyl alcohol [1:2 (volume ratio), 210 ml] was added dropwise. The mixture was stirred at room temperature for 1 hr. The precipitated crystals were collected by filtration and washed with water to give 1-(2-cyanoacetyl)-3-(2-fluoro-4-iodophenyl)-urea 79 (wet crystals), which was used for the next reaction in the form of wet crystals.

Herkunft & Nachweise